Typewriter platen and process for producing the same



May 29, 1928. 1,671,763 c. T. DICKEY TYPEWRITER PLATEN AND PROCESS FOR PRODUCING THE SAME Filed June 4, 1926 INVENTOR M Thur- 1 1' ATTORNEY Patented May 29, 1928.

UNITED STATES PATENT OFFICE.

CHARLES '1. DICKEY, OE ELIZABETH, NEW JERSEY, ASSIGNOR TO RODIC RUBBER 00., 0F GARWOOD, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TYPEWRITER PLA'IEN PROCESS FOR PRODUCING THE SAME.

Application filed June 4,

My invention relates to typewriter platens and refers particularly to platens Wl'llCh are practically noiseless during their employment. v I

The object of my invention is a typewriter platen in which the noise incident to operation is greatly reduced without affecting its writing, or impression, properties.

Typewriter platens have a hard smooth external face torec'eive the type impacts and experiments have shown that thisexterior portion of a platen must have particular and exact physical properties, in order to produce the best results.

The device of my invention is of such a character that this exterior portion may be of such chemical and physical composition and construction as to roduce the desired results, and may be varied as desired, without affecting the noise reducing properties of my platen.

It is evident, therefore, that the particular elements of my invention may be successfully applied to any typewriter platenirrespective of the character of its outer, or operative portion.

I have found that the noise of a platen incident to operation may be greatly reduced if it have an inner core of a rubber-treated fibrous material, and without limiting myself to such material, I prefer. to use loose wool, or wool fibers, for this purpose.

In the accompanying drawings, illustrating my device as produced from loose wool, similar parts are designated by similar numerals.

Figure 1 is a side view of one form of the device of my invention, partly broken away to illustrate its several layers.

Figure 2 is a cross-section through the line 22 of Figure 1.

The particular form of the device of my invention, as shown in the accompanying drawings, comprises an exterior layer of hard rubber 10 producing the impact face of the platen. Within the rubber la er is a core 11 consisting of loose wool, rub er and rubber cement within which is an inner lining of fabric 12. I

The following is a process of In invention for theproduction of the ill iistrated platen :Loose wool .is worked in an unvulcanized rubbercement until thoroughly impregnated with the cement, and isthen dried writer platens, the steps 1926. Serial No. 113,674.

to the proper consistency. It is then applied to a mandrel covered with a fabric and calendered to the desired thickness. The vulcanized rubber is then applied to the exterior of the described mixture device and the entire device is then vulcanized. The fabrics are not essential but I prefer to employ them for ease of production and greater permanency of the produced platen.

I have found that a platen thus produced has valuable noise-reducing properties and that the sound of the key impacts are greatly given simply as a means for clearly describing my invention.

' What I claim is 1. In a process for the production of typew ich comprise saturating a fibrous material with a rubber cement composition, forming a core therefrom, covering the exterior surface of the core with a layer of unvulcanized rubber and vulcanizing the device thus produced.

2. In a process for the production of typewriter platens, the steps which comprise saturating loose wool with a rubber cement composition, forming a core therefrom, covering the exterior surface of the core with a layer' of unvulcanized rubber and vulcanizing the device thus produced.

3. In a process for the production of typewriter platens, the steps which com rise saturating a fibrous material with a ru ber cement composition, forming a core therefrom over a fabric, -covering the exterior surface of the core with a layer of unvulcanized rubber and vulcanizing the device thus formed. I 4. In a process for the production of typewriter platens, the steps which comprise saturating loose wool with a rubber cement com osition, forming acore therefrom over a. fabric, covering the exterior surface of the core with a layer of unvulcanized rubber and vulcanizing the device thus formed.

5. In a platen, in combination, an exterior layer of vulcanized rubber, a core of loose fiber interior thereof impregnated with vulcanized rubber and a fabric lining interior of the impregnated core.

6. In a platen, in combination, an exterior layer of vulcanized rubber, a core of loose wool interior thereof impregnated with vuloanized rubber and a fabric lining interior of the impregnated core.

Signed at Garwood in the county of Union 10 and State of New Jersey this 29th day of May, 1926.

CHARLES T. DICKEY. 

